Latch for telescopic sections.



T. JMITGHELL & J. A. MGCREARY. LATCH FOR TELESGOPIG SECTIONS.

I NoIeR/s PETERS Q0.. PHOTGLITHO., wASHlNGroN. D. c.

T. J. MITCHELL c J. A. MGCREARY.

' LATCH FOR TELESCCPIC SECTIONS. APPLICATION FILED AUG. 30, 1913.

. N; w L' 'W A' i I -d M L; i; v l N N w m. i N i LT m Q @W I s *mi f Wl! 1 f I 1 e A@ K g I W Q l l N N "M v l l a E N Q I n N1 Il @ww/Mou lAmamas z'chelll- STATES PATENT @dilhlf THOMAS J'. MITCHELL AND JAMES A.MOCREARY, OF UNION'IOWN, PENNSYLVANIA..

LATCH FOR TELESCOPIC SECTIONS.

Application filed August 30, 1913.

To aZZ 'whom it may concern:

Be it known that we, Trronms J. MITCHELL and JAMns A. MGCREARY, citizensof the United States, residing at Uniontown, in the county of Fayetteand State of Pennsylvania, have invented certain new and usefulImprovements in Latches for Telescopic Sections, of which the followingis a speciiication.

The present invention relates to an improved latch mechanism which isadapted to be employed in connection with telescoping sections ormembers such as are frequently embodied in discharging rams for cokingovens, such a discharging ram being shown by Patent No. 891,850 whichwas granted to us June 30, 1908 for improvements in coke oven apparatus,the object of this invention being to provide a latch mechanism whichembodies novel features of construction whereby each telescoping sectionis se curely locked in a retracted position until after the precedingsection has been completely projected and the two sections lockedtogether for unitary movement.

A further object of the invention is to provide a device of thischaracter which is comparatively simple and inexpensive in itsconstruction, which is positive and reliable in its operation, and whichrequires no adjustment or particular attention on the part of theoperator.

`With these and other objects in view, the invention consists in certainnovel combinations and arrangements of the parts as will more fullyappear as the description proceeds, the novel features thereof beingpointed out in the appended claims.

For a full understanding of the invention, reference is to be had to thefollowing description and accompanying drawings, in which z- Figure l isa longitudinal sectional view through the telescoping sections of a cokeoven discharging ram constructed in accordance with the invention, theinner telescoping section being shown as fully projected and in positionfor being locked with the next telescoping section, and portions beingbroken away and shown in section to more clearly illustrate theinvention. Fig. 2 is a similar view showing the position assumed by theparts when the telescoping sections are being retracted and slightlybefore the outer section has been completely retracted so that the innersection must be Specification of Letters Patent.

Patented dan. 19, 1915.

Serial No. 787,540.

unlocked therefrom. Fig. 3 is a detail view.

of the latch roller upon the outer telescoping section, and Fig. 1 is anenlarged transverse sectional view on the line l-ll of Fig. 1.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

Specifically describing the present embodiment of the invention, thereference character ift indicates the fixed casing or housing which isrigidly mounted in some suitable manner upon the support, the saidhousing being shown as formed of the vertical side plates 1 and the topplate 2, angle irons 3 being vprovided for connecting the upper edges ofthe side plates 1 to the top plate 2, and reinforcing angle irons ebeing applied to the lower edges of the side plates 1. An outertelescoping member B is slidably mounted for longitudinal movementwithin the casing A, in any suitable manner such as that shown by ourprior Patent No. 891,850 which was granted to us June 30, 1908 forimprovements in coke oven apparatus. This outer telescoping member B isshown as composed of the two spaced I beams 5 and the top plate 6.

An inner telescoping member C is slidably mounted for longitudinalmovement within the outer telescoping member B, the said telescopingmember C being shown as composed of the spaced channel irons 7 and a topplate 8. At suitable intervals in the length of the inner telescopingmember C, trunnions or journals 9 project from opposite sides therefrom,the said journals carrying the rollers or wheels 10 which engage theinner faces of the l beams 5 and serve to support the inner telescopingmember C upon the telescoping member B.

A bearing plate 11 is secured to the inner face of one of the beams 5,the said bearing plate being provided with a stub shaft or trunnion 12upon which a roller 13 is journaled. This roller 18 is adapted to beengaged by a hooked detent 11i for the purpose of locking the outertelescoping member B in a retracted position until after the innertelescoping member C has been fully projected. The hooked detent 14- iscarried by a transverse shaft 15 which is journaled in suitable bearings16 which project downwardly from the reinforcing angle irons i at thebottom of the housing A, and rigid with-fthehooked detent 14 is a arm 17which is provided at the extremity thereof with a roller 18. The arm 17and hooked detent 14 project in opposite directions from the shaft 15,and when the arm 17 is forced downwardly, as indicated by Fig. 1, thehooked detent 14 is moved upwardly into :operative position so as toengage the roller 13 and securely retain the telescoping member B in aretracted position.

The lower faces of the I beams 5 are provided with racks 19, and a rackplate 20 is Vapplied 'to the bottom of the inner telescopuing member C,the central portion of the plate 20 being provided with the teeth 20a,while the side portions of the rack plate '.upon each side of the teeth20:l are smooth as indicated at 20h. When the hooked detent or latchmember 14 is in operative position, :as indicated by Figs. 1 and`3, theroller 18 of the lever 17 travels uponl one of the smooth side portions20b of the rack plate 20.

The inner telescoping member C is provided toward the inner end thereofwith a vertically disposed locking bolt 21 which is ffslidably vmountedupon a suitable guide .member 22, the upper end vof the locking:,boltzprojecting through an opening in the .top ofthe inner telescopingmember C and terminating in an anti-friction roller 23 which is adaptedto travel upon the lower face of the top plate 6 of the outertelescoping member B. The lower end of the. lock- .ing bolt 21 ispivotally connected at 24 to Vone end of a lever 25 which extends longi-Vtudinally of the inner telescoping member `C and is pivotally mountedat an intermediate point in 'its length upon the transverse pivot rod26. The opposite end of the lever 25 is provided with a suitablecounter-weight 27 and has a cam face 28 upon the lower side thereof.

When the inner telescoping member C has been fully projected so that therack 20L thereof is about to escape from the main vdriving pinion 29which may be mounted in any suitable manner, the locking bolt 21 isbrought into registry with an opening 30 formed 4in the top plate 6ofthe outer telescoping member B. A reinforcing plate 31 is appliedtothe top of the said plate 6 at the rear edge of the opening 30, whilea stop 32 is applied to the lower face of the plate 6 at the oppositeside of the said opening. The nose of the locking bolt 21 engages thestop 32 when the bolt is in registry with the `opening 30, and theaction of the counterweight 27 then causes the locking bolt to be movedupwardly so that the nose thereof enters the opening 30. The roller 18at the .end of the arm 17 at the same timevescapes from the inner end ofthe telescoping mem- -ber .C so as to permit of the hooked detent .p rlatch .member 14 dropping into an inoperative position and releasing theroller 13 ofthe telescoping member-iB. l'Thetwo telescoping members Band C are thus securely locked together so as to have a unitary movementand the outer telescoping member B released from the housing A so as tobe moved outwardly with the inner telescoping member C. As soon as theouter telescoping member B has been slightly advanced the racks 19thereof are brought into engagement with the main driving pinion 29 sothat the members may be advanced by a continuous rotary movement of thesaid driving pinion.

The usual ram may be attached to the telescoping member C, and when itis desired to retract the telescoping members, the driving pinion 29 isrotated in a reverse direction. As soon as the outer telescoping memberB has been completely retracted, the driving pinion 29 is brought intoengagement with the cam face 28 of the lever so as to move thecounter-weighted end of the lever upwardly and retract the locking bolt21 from engagement with the opening 30 of the plate 6. In thisconnection it may be noted that the lever 25 projects downwardly througha longitudinal slot 33 formed in the rrack plate 2O so that the cam face28 of the lever will be engaged by the driving pinion 29 as justdescribed upon the retraction of the telescoping members,

while when the inner telescoping member C has been fully projected, theend of the `lever 25 may be engaged by the driving pinion 29 to assistthe counter-weight 27 in throwing the locking bolt 21 upwardly intooperative position. Vhen the telescoping members are being retracted,the engagement of the driving pinion 29 with the cam face 28 serves tolift the counter-weight 27 and withdraw the locking bolt 21 4fromoperative position so as to release the inner telescoping member C fromthe outer telescoping member B A cam or inclined face 34 at the innerextremity of the telescoping member `C is also brought into engagementwith the roller 18 of the arm 17 so as to force the said leverdownwardly and swing the hooked detent 14 upwardly into operativeposition. The telescoping member B is then securely locked in aretracted position and the inner telescoping member C released therefromso as to be completely retracted within the outer telescoping member B.It will thus be yobvious that byv rotating the driving pinion 29 in onedirection the several telescoping members may be projected in `regularorder and coupled together for unitary movement, while upon reversingthe direction of rotation Vof the driving pinion 29 the telescopingmembers may be retracted and uncoupled in the reverse order.

Having thus described the invention, what we claim as-new and desire tosecure .by Let-V ters Patent, Yis

masses kL. A discharging mechanism for coke,

for coupling and uncoupling the separatesections, and an independentlyoperated latching device including a relatively stationary element onone telescopingsection, a movable element carried by said fixed member,and an element carried by one of said telescoping sections andcooperating with said movable element to engage it with said stationaryelement.

2. A discharging mechanism, for coke ovens and similar structures,including a fixed casing member,separate telescoping sections arrangedone within the other, a driving element common to said sections forsuccessively projecting the same, an automatically operating lockingdevice partly controlled by the driving element andhaving means forcoupling and uncoupling the separate sections, and an independently operated latching device including a relatively stationary element on onetelescoping section, a swinging hooked detent carried by the Xed memberand adapted to normally 4disengage itself from said stationary element,and a cam element carried by one of said telescoping sections andcooperating with said detent element to engage it with said stationaryelement.

3. The combination Voit a housing, telescoping sections mounted Withinthe housing, means for successively projecting the telescoping sectionsin regular order, a swinging latch member upon the housing forengagement with the outer telescoping section to retain the same in aretracted position, an arm rigid with the swinging latch member, and cammeans upon the inner telescoping section for cooperation with the arm tomove the latch into operative position and retain it in such positionwhen the telescoping members are retracted, the latch member beingreleased to unlock the outer telescoping section when the innertelescoping section has been completely projected.

4. The combination of ahousing, telescoping sections mounted within thehousing, means for successively projecting the telescoping sections inregular order, a swinging latch member carried by the housing forengagement with the outer telescoping section, an arm rigid with thelatch member and provided with a roller, a track upon the innertelescoping section which engages the roller to hold the latch member inoperative position when the telescoping sections are re tracted, theroller escaping from the end of the track and releasing the latch memberwhen the inner telescoping section has been completely projected.

5. The combination of a housing, telescoping sections mounted within thehousing, means for successively projecting the teleseoping sections inregular order, a swinging latch member for engagement with the outertelescoping section to retain the same in. a retracted position, an armcontrolling the latch member, a roller upon the arm, a track upon theinner telescoping sec tion for engagement with the roller to retain thelatch in operative position when the telescoping sections are retracted,the roller escaping from the end of the track and releasing the latchmember wheny the inner telescoping section has been completelyprojected, and cam means upon the inner telescoping section for bringingthe roller back into engagement with the track when thetelescopingsections are again retracted.

6. ylihe combination or housing, telescoping sections mounted within thehous ing, means for successively projecting the telescoping sections inregular order, a

hooked latch member pivotally mounted upon the housing, a roller uponthe outer telescoping section for engagement with the hooked latchmember to retain the outer tele` scoping section in a retractedposition, an arm rigid with the latch member, a roller upon the arm, atrack upon the inner telescoping section for engagement with the rollerto retain the latch member in operative position, the roller escapingfrom the end of the track to release the latch member when the innertelescoping section has been completely projected, and cam means upon.the inner telescoping section for bringing said roller back intoengagement with the track whenv the telescoping sections are againretracted. j

In testimony whereof we hereunto aix our signatures in the presence oftwo witnesses.

THOMAS J. MITCHELL. J. A.. MCCREARY. Vfitnesses to signature ofMitchell:

AUGUSTUS P. Lowny, SAMUEL ELIOT. Witnesses to signature of McCreary:

J. W. MITCHELL, W. D. McGinnis.

Copies of this patent may be obtained for ve` cents each, by addressingthe Commissioner of Patents,

' Washington, D. (1.

